Breaking Bread
It is customary to slice the challah on Shabbos before reciting Ha’motzi. The source of this halacha comes from a wicked king. Discussing the origins of this halacha never grows stale.
Sanhedrin 102
Dough Adir
Rebbe Abba says that on Shabbos, one is obligated to recite ha’motzi on two loaves of bread (Shabbos 117b). This is to commemorate the double portion of manna that fell on Friday.